Tait TB8100 - Figure 7.4 Identifying the Circuitry on the 12 V PA Boards

TB8100 Service Manual Power Amplifier Circuit Description 125
© Tait Electronics Limited September 2006
Figure 7.4 Identifying the circuitry on the 12V PA boards
b
RF output
c
low pass filter/directional coupler board
d
control board
e
power supply
f
60W board
g
microprocessor
h
6W board temperature sense
i
6W driver transistor drain current sense
j
ambient air temperature board
1)
I
2
C signal filtering
1!
RF input
1@
12VDC output for reciter
1#
6W board
1$
pre-driver transistor
1%
6W driver transistor
1^
50W interconnect board
1&
12VDC output
1*
28VDC output
1(
60W board temperature sense
2)
60W final transistor
2!
60W final transistor drain current sense
2@
boost regulator board
2#
12VDC input
Note:
This drawing shows a 50W VHF (B-band) 12V PA. The 5W 12V PA
has the same configuration, except the 5W interconnect board is
fitted in place of the 50W interconnect board and 60W board.
j
d
f
g
h
i
1)
b
1!
c
e
1#
1$
1%
1^
1&
1*
1@
2@
2#
1(
2)
2!